:root {
  --bg0: #070815;
  --bg1: #0c1030;
  --paper: #fff7f0;
  --paper2: #fff0e3;
  --ink: #15121b;
  --muted: rgba(21, 18, 27, 0.72);
  --pink: #ff4d8d;
  --pink2: #ff7ab0;
  --shadow: rgba(0, 0, 0, 0.28);
  --shadow2: rgba(0, 0, 0, 0.16);
  --env: #f5d6c6;
  --env2: #f0c8b3;
  --env3: #e7b59a;
  --accent: #7c5cff;
  --ok: #19c37d;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
  color: #eae7ff;
  overflow: hidden;
  background: radial-gradient(1200px 700px at 50% 30%, #1a1e55 0%, var(--bg0) 60%, #050512 100%);
  transition: background 900ms ease;
}

.bg {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(700px 420px at 25% 15%, rgba(255, 77, 141, 0.16), transparent 60%),
    radial-gradient(900px 520px at 75% 30%, rgba(124, 92, 255, 0.18), transparent 60%),
    radial-gradient(900px 700px at 50% 90%, rgba(255, 122, 176, 0.08), transparent 55%);
  pointer-events: none;
  transition: opacity 800ms ease;
}

body.is-valentine {
  /* Brighter, classic Valentine palette (less "night mode") */
  background:
    radial-gradient(900px 520px at 20% 10%, rgba(255, 77, 141, 0.40), transparent 60%),
    radial-gradient(1000px 620px at 80% 20%, rgba(255, 122, 176, 0.35), transparent 62%),
    radial-gradient(1200px 900px at 50% 90%, rgba(124, 92, 255, 0.18), transparent 60%),
    linear-gradient(180deg, #fff2f7 0%, #ffd7e7 38%, #ffeef6 100%);
  color: #2b1020;
}
body.is-valentine .bg { opacity: 0.16; }

.envelope-wrap.is-fading-out {
  opacity: 0;
  transform: translateY(12px) scale(0.99);
  transition: opacity 600ms ease, transform 600ms ease;
  pointer-events: none;
}

.stage {
  height: 100%;
  display: grid;
  place-items: start center;
  padding-top: 24px;
}

.scene {
  width: min(1000px, 96vw);
  height: min(780px, 92vh);
  position: relative;
  display: grid;
  place-items: start center;
  perspective: 1400px;
}

.envelope-wrap {
  position: relative;
  width: min(520px, 92vw);
  height: 420px;
  display: grid;
  place-items: start center;
  transform-style: preserve-3d;
}

.shadow {
  position: absolute;
  top: 260px;
  width: 340px;
  height: 60px;
  background: radial-gradient(closest-side, rgba(0, 0, 0, 0.25), transparent 70%);
  transform: translateZ(-1px);
  opacity: 0.0;
  filter: blur(0.5px);
}

.envelope-wrap.is-falling {
  animation: env-fall 900ms cubic-bezier(.2,.8,.2,1) forwards;
}
.envelope-wrap.is-falling .shadow {
  animation: shadow-in 900ms cubic-bezier(.2,.8,.2,1) forwards;
}

@keyframes env-fall {
  0% { transform: translateY(-520px) rotateZ(-4deg) rotateX(18deg); }
  68% { transform: translateY(16px) rotateZ(2deg) rotateX(6deg); }
  80% { transform: translateY(0px) rotateZ(-1deg) rotateX(0deg); }
  100% { transform: translateY(0px) rotateZ(0deg) rotateX(0deg); }
}

@keyframes shadow-in {
  0% { opacity: 0; transform: translateY(0) scale(0.7); }
  68% { opacity: 0.26; transform: translateY(0) scale(1.05); }
  100% { opacity: 0.18; transform: translateY(0) scale(1); }
}

.envelope {
  position: absolute;
  top: 40px;
  width: min(460px, 88vw);
  height: 280px;
  z-index: 2;
  transform-style: preserve-3d;
  filter: drop-shadow(0 20px 30px rgba(0, 0, 0, 0.35));
}

.env-back {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--env) 0%, var(--env2) 100%);
  border-radius: 18px;
  outline: 1px solid rgba(0, 0, 0, 0.08);
}

.env-front {
  position: absolute;
  inset: 0;
  border-radius: 18px;
  background:
    linear-gradient(135deg, transparent 54%, rgba(0, 0, 0, 0.06) 54%, rgba(0, 0, 0, 0.06) 56%, transparent 56%),
    linear-gradient(225deg, transparent 54%, rgba(0, 0, 0, 0.06) 54%, rgba(0, 0, 0, 0.06) 56%, transparent 56%);
  clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 50% 64%, 0% 100%);
  background-color: var(--env2);
  outline: 1px solid rgba(0, 0, 0, 0.08);
}

.env-letter-slot {
  position: absolute;
  left: 24px;
  right: 24px;
  top: 26px;
  height: 78px;
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(0,0,0,0.09), rgba(0,0,0,0.0));
  opacity: 0.22;
}

.env-flap {
  position: absolute;
  inset: 0;
  border-radius: 18px;
  transform-origin: 50% 0%;
  transform: rotateX(0deg);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.18), transparent 40%),
    linear-gradient(135deg, transparent 49%, rgba(0, 0, 0, 0.05) 49%, rgba(0, 0, 0, 0.05) 51%, transparent 51%);
  background-color: var(--env3);
  clip-path: polygon(0% 0%, 100% 0%, 50% 58%);
  transition: transform 650ms cubic-bezier(.2,.8,.2,1);
  transform-style: preserve-3d;
  outline: 1px solid rgba(0, 0, 0, 0.06);
}

.envelope-wrap.is-open .env-flap {
  transform: rotateX(165deg);
}

.paper {
  position: absolute;
  top: 78px;
  width: min(520px, 92vw);
  height: min(650px, 82vh);
  z-index: 5;
  transform-style: preserve-3d;
  transform: translateY(120px) scale(0.96);
  opacity: 0;
  pointer-events: none;
  transition:
    transform 850ms cubic-bezier(.16,.85,.2,1),
    opacity 350ms ease;
}

.paper.is-hidden { display: none; }

.envelope-wrap.is-paper-out .paper {
  display: block;
  opacity: 1;
  transform: translateY(0px) scale(1);
  pointer-events: auto;
}

.paper-inner {
  position: absolute;
  inset: 0;
  border-radius: 18px;
  transform-style: preserve-3d;
  transition: transform 900ms cubic-bezier(.2,.85,.2,1);
}

.paper-inner.is-flipped { transform: rotateY(180deg); }

.paper-face {
  position: absolute;
  inset: 0;
  background: radial-gradient(1200px 900px at 40% 0%, var(--paper) 0%, var(--paper2) 56%, #ffe9d7 100%);
  border-radius: 18px;
  color: var(--ink);
  box-shadow:
    0 18px 40px var(--shadow),
    0 2px 0 rgba(0,0,0,0.06) inset;
  backface-visibility: hidden;
  overflow: hidden;
  padding: 26px 26px 20px;
}

.paper-face::after {
  content: "";
  position: absolute;
  inset: -40px;
  background:
    radial-gradient(200px 160px at 20% 20%, rgba(255, 77, 141, 0.10), transparent 60%),
    radial-gradient(240px 220px at 80% 30%, rgba(124, 92, 255, 0.10), transparent 60%),
    radial-gradient(260px 220px at 35% 90%, rgba(0, 0, 0, 0.06), transparent 65%);
  pointer-events: none;
  mix-blend-mode: multiply;
  opacity: 0.8;
}

.paper-front { transform: rotateY(0deg); }
.paper-back { transform: rotateY(180deg); }

.paper-top {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 10px;
  padding-bottom: 14px;
  border-bottom: 1px dashed rgba(21, 18, 27, 0.2);
}

.paper-title {
  font-weight: 800;
  letter-spacing: 0.2px;
  font-size: 18px;
}

.fn-text {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 13px;
  line-height: 1.4;
  color: rgba(21, 18, 27, 0.78);
  background: rgba(255, 255, 255, 0.35);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 12px;
  padding: 10px 12px;
}

.graph-wrap {
  position: relative;
  z-index: 1;
  margin-top: 16px;
  background: rgba(255, 255, 255, 0.45);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 16px;
  padding: 14px;
}

canvas#graph {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(12, 16, 48, 0.04), rgba(12, 16, 48, 0.0));
  aspect-ratio: 920 / 520;
  max-height: 48vh;
}

.graph-caption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--muted);
}

.next-btn {
  position: absolute;
  right: 22px;
  bottom: 18px;
  z-index: 2;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid rgba(0, 0, 0, 0.1);
  background: linear-gradient(180deg, #fff 0%, #ffe6f0 100%);
  color: #2b1020;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(255, 77, 141, 0.18);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 260ms ease, transform 260ms ease;
}
.next-btn.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.next-btn:focus-visible { outline: 3px solid rgba(124, 92, 255, 0.45); outline-offset: 3px; }

.paper-back {
  padding: 34px 28px 26px;
}

.back-top {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 18px;
  place-items: start center;
  padding-top: 8px;
}

.back-title {
  font-size: 26px;
  font-weight: 900;
  letter-spacing: 0.2px;
}

.big-letters {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 1000;
  font-size: clamp(46px, 7vw, 84px);
  letter-spacing: 0.12em;
  padding: 6px 10px 2px;
}

.answers {
  position: relative;
  z-index: 1;
  margin-top: 56px;
  display: grid;
  gap: 14px;
  place-items: center;
}

.answers-title {
  font-size: 18px;
  font-weight: 850;
  color: rgba(21, 18, 27, 0.84);
}

.choices {
  display: flex;
  gap: 14px;
}

.choice {
  min-width: 110px;
  padding: 12px 16px;
  font-weight: 950;
  font-size: 18px;
  border-radius: 14px;
  border: 1px solid rgba(0, 0, 0, 0.12);
  cursor: pointer;
  box-shadow: 0 14px 30px var(--shadow2);
  transition: transform 160ms ease, box-shadow 160ms ease;
}
.choice:active { transform: translateY(1px) scale(0.99); }
.choice:focus-visible { outline: 3px solid rgba(255, 77, 141, 0.35); outline-offset: 3px; }

.choice-ll {
  background: linear-gradient(180deg, #ffffff 0%, #fff1f7 100%);
  color: #2b1020;
}
.choice-ss {
  background: linear-gradient(180deg, #ffffff 0%, #eefcff 100%);
  color: #0d2530;
}

/* Modal */
.modal { position: fixed; inset: 0; display: grid; place-items: center; z-index: 999; }
.modal.is-hidden { display: none; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(0, 0, 0, 0.55); }
.modal-card {
  position: relative;
  width: min(440px, 92vw);
  border-radius: 18px;
  background: #101028;
  color: #f7f5ff;
  border: 1px solid rgba(255,255,255,0.10);
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.6);
  padding: 18px 18px 14px;
}
.modal-title { font-weight: 950; font-size: 18px; letter-spacing: 0.2px; }
.modal-body { margin-top: 10px; color: rgba(247,245,255,0.86); line-height: 1.45; }
.modal-actions { margin-top: 14px; display: flex; justify-content: flex-end; }
.modal-ok {
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.14);
  background: linear-gradient(180deg, rgba(255, 122, 176, 0.30), rgba(124, 92, 255, 0.25));
  color: #fff;
  font-weight: 900;
  cursor: pointer;
}
.modal-ok:focus-visible { outline: 3px solid rgba(255, 122, 176, 0.35); outline-offset: 3px; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .envelope-wrap.is-falling { animation: none; transform: translateY(0); }
  .shadow { animation: none; opacity: 0.16; }
  .env-flap { transition: none; }
  .paper, .paper-inner { transition: none; }
  .next-btn { transition: none; }
}

/* Valentine overlay */
.valentine {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: grid;
  place-items: center;
  pointer-events: none;
  opacity: 0;
  transition: opacity 700ms ease;
}
.valentine.is-hidden { display: none; }
.valentine.is-on {
  display: grid;
  opacity: 1;
  pointer-events: auto;
}

/* ADDED: constrain the image size and add styling */
.valentine img {
  max-width: min(500px, 85vw);
  max-height: min(600px, 75vh);
  width: auto;
  height: auto;
  border-radius: 20px;
  box-shadow: 0 24px 60px rgba(0,0,0,0.35);
  object-fit: contain;
}

.hearts {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.heart {
  position: absolute;
  top: -40px;
  font-size: 22px;
  filter: drop-shadow(0 10px 18px rgba(0,0,0,0.24));
  opacity: 0.0;
  will-change: transform, opacity;
  animation: heart-fall var(--dur, 3.4s) linear forwards;
}
@keyframes heart-fall {
  0% { transform: translate3d(var(--x, 0px), -40px, 0) rotate(var(--r, 0deg)); opacity: 0; }
  10% { opacity: 0.95; }
  100% { transform: translate3d(var(--x, 0px), calc(100vh + 60px), 0) rotate(calc(var(--r, 0deg) + 220deg)); opacity: 0.0; }
}

.note {
  width: min(720px, 92vw);
  border-radius: 22px;
  background:
    radial-gradient(700px 420px at 20% 0%, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0.76) 55%, rgba(255, 255, 255, 0.88)),
    linear-gradient(180deg, rgba(255, 239, 246, 0.85), rgba(255, 255, 255, 0.75));
  border: 1px solid rgba(255, 77, 141, 0.18);
  box-shadow: 0 22px 70px rgba(255, 77, 141, 0.18), 0 16px 44px rgba(0,0,0,0.18);
  color: #2b1020;
  transform: translateY(10px) scale(0.985);
  opacity: 0;
  transition: transform 700ms cubic-bezier(.2,.85,.2,1), opacity 700ms ease;
  pointer-events: auto;
  max-height: 86vh;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}
.valentine.is-on .note {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.note-inner { padding: 22px 22px 20px; }
.note-title {
  font-weight: 1000;
  letter-spacing: 0.2px;
  font-size: 16px;
  opacity: 0.7;
}
.note-body {
  margin-top: 10px;
  font-size: clamp(18px, 2.4vw, 26px);
  font-weight: 900;
  line-height: 1.25;
}
.note-sign {
  margin-top: 14px;
  font-size: 18px;
  font-weight: 1000;
  letter-spacing: 0.2px;
  color: rgba(43, 16, 32, 0.82);
  text-align: right;
}

/* Mobile layout tweaks */
@media (max-width: 520px) {
  .stage { padding-top: 14px; }
  .scene { height: 94vh; }

  .envelope { top: 26px; }

  .paper-face { padding: 18px 16px 16px; }
  .paper-title { font-size: 16px; }
  .fn-text { font-size: 12px; padding: 8px 10px; }
  .graph-wrap { padding: 10px; }
  .graph-caption { font-size: 11px; }

  .next-btn { right: 14px; bottom: 14px; padding: 10px 12px; }

  .paper-back { padding: 26px 18px 18px; }
  .back-title { font-size: 22px; }
  .big-letters { letter-spacing: 0.08em; }

  .choices { flex-direction: column; width: 100%; }
  .choice { width: 100%; max-width: 320px; }

  .note-inner { padding: 18px 16px 16px; }
  .note-body { line-height: 1.22; }
}